重复时间 2024-06-18 2024-09-28 2025-02-22 Equestrian Portraits in the Eighteenth and Nineteenth Centuries     It was common for European rulers from the eighteenth ...

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Noise in the Sea   Sound is one of the most important means of communication for creatures underwater. In the clear water of a coral reef you can see up to 200 feet at most. I...

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